Searches for Exotic Hadrons at GlueX

Abstract

The search for hybrid mesons and the detailed study of their spectrum is the primary goal of the GlueX Experiment in Hall D at Jefferson Lab. The identification and study of hybrid mesons promises to provide unique insight into gluonic degrees of freedom in QCD and the nature of confinement. The experiment combines an intense photon beam with linear polarization peaking around 9 GeV incident on a liquid hydrogen target with a nearly hermetic spectrometer, allowing for the comprehensive study of charged and neutral particle final states. The first phase of the experiment has recently concluded, yielding a photoproduction data set of unprecedented size and quality. We report on the status of the analysis of this data, including measurements of polarization observables, progress in spectroscopic measurements of light mesons, and the measurement of the photoproduction of $J/\psi$ near threshold, which is providing critical insight into the nature of the LHCb closed-charm pentaquark candidates.

arXiv comment8 pages, 5 figures, proceedings for at The 15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2019)

References in corpus (21)

• Observation of $J/\psi p$ resonances consistent with pentaquark states in ${\Lambda }_b^0\to J/\psi K^{-}p$ decays
• Observation of a narrow pentaquark state, $P_c(4312{)}^{+}$, and of two-peak structure of the $P_c(4450{)}^{+}$
• How to reveal the exotic nature of the P_c(4450)
• Understanding the newly observed heavy pentaquark candidates
• Hybrid Mesons
• First measurement of near-threshold J/$\psi$ exclusive photoproduction off the proton
• Toward the excited isoscalar meson spectrum from lattice QCD
• Formation of hidden-charm pentaquarks in photon-nucleon collisions
• Model-independent evidence for $J/\psi p$ contributions to ${\Lambda }_b^0\to J/\psi p{K}^{-}$ decays
• Photoproduction of hidden charm pentaquark states $P_c^{+}(4380)$ and $P_c^{+}(4450)$
• Determination of the pole position of the lightest hybrid meson candidate
• Photoproduction of Exotic Baryon Resonances
• Holographic $J/\psi$ production near threshold and the proton mass problem
• Photoproduction of charm near threshold
• Studying the P_c(4450) resonance in J/psi photoproduction off protons
• Odd and Even Partial Waves of $\eta {\pi }^{-}$ and ${\eta }^{\prime }{\pi }^{-}$ in ${\pi }^{-}p\to {\eta }^{(\prime )}{\pi }^{-}p$ at $191\text{GeV}/c$
• Measurement of the beam asymmetry $\Sigma$ for ${\pi }^0$ and $\eta$ photoproduction on the proton at $E_{\gamma }=9$ GeV
• The GlueX Start Counter Detector
• Design and construction of a high-energy photon polarimeter
• The GlueX Central Drift Chamber: Design and Performance
• A measurement of the energy and timing resolution of GlueX Forward Calorimeter using an electron beam

Cited by in corpus (2)

• Decays of an exotic $1^{-+}$ hybrid meson resonance in QCD
• Three-body dynamics of the $a_1(1260)$ resonance from lattice QCD